Simultaneous Electrochemical Formation of Ta2O5/Poly (3, 4-ethylenedioxythiophene) Layers

Ta2O5/polyethylenedioxythiophene (poly (EDT)) bi-layered film as dielectric and electrolyte exhibited low impedance characteristics of a solid Ta capacitor. The bi-layered film was simultaneously formed by electrooxidizing a Ta electrode in EDT monomer aqueous solution containing sulfonic surfactant electrolytes, i.e., sodium salts of n-dodecylbenzenesulfonate (SDBS), butylnaphthalenesulfonate (BNS) and n-dodecylsulfate (SDS). The bi-layered film consisted of Ta2O5 sustaining 50 to 200 V of formation voltage and electroactive poly (EDT) film.